package com.joey.websocket;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

public class WSServerInitializer extends ChannelInitializer<SocketChannel>{

	@Override
	protected void initChannel(SocketChannel channel) throws Exception {
		// 通过SocketChannel去获得对应的管道
		ChannelPipeline pipeline  = channel.pipeline();
		
		//websocket基于http协议，所以要有http编解码
		pipeline.addLast(new HttpServerCodec());
		
		//对写大数据流的支持
		pipeline.addLast(new ChunkedWriteHandler());
		
		//对httpMessage进行聚合，聚合成FullHttpRequest或FullHttpResponse
		//几乎在netty中的编程，都会使用到此handler
		pipeline.addLast(new HttpObjectAggregator(1024*64));

		//====================以上是用于支持HTTP协议====================
		
		/**
		 * websocket服务器处理的协议，用于指定给客户端连接访问的路由：/ws
		 * 本handler会帮你处理一些繁重复杂的事
		 * 会帮你处理握手动作：handshaking（close，ping，pong）ping+pong=心跳
		 * 对于websocket来讲，都是以frames进行传输的，不同的数据类型对应的frames也不同
		 */
		pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));
		
		//用户自定义handler
		pipeline.addLast(new ChatHandler());
	}


}
